Add Chosen for the organisation select
Reformat the new need form

Group fields into fieldsets to break up the form a
little bit. Use a bit of friendlier wording around
the title.
Restyle the header on the needs index page
A few style changes to the navbar

- Remove the gradient and make it a bit flatter and static.
- Drop the "GOV.UK". Just "Maslow". It's cleaner.
- Say hello to our users.
Add a "Create Need" button directly after the user story
Fix integration test to handle multiple buttons
Add padding below the Add a new need button
Fix help text margin after the organisation select field
Change fieldset label
Display the current release sha in the footer
Remove the "form-horizontal" class from our HTML.

To get this working, Sass needs to process the Bootstrap and needs form
stylesheets together, so the `@extend` directive can access the extended
rules. This doesn't play nicely with the asset pipeline's `require_tree`
command, so we need to replace that with individual imports.
Pull presentational classes out of the need form.

Using `span2` and `span8` couples our markup tightly together with our
presentation.
Merge remote-tracking branch 'origin/master' into tidy-up-form

Conflicts:
	app/views/needs/new.html.erb
Merge pull request #8 from alphagov/tidy-up-form

Tidy up Maslow